Clock-dial



(No Model.)

J. R. PAYSON, Jr.V

GLOGKDIAL.

N0. 258,801. Patented May 30,1882.

N, PETERS. Phmuthagnpmr. wammgwn. D4 C.

UNITED STATES JOSEPH R. PAYSON, JR.,

PATENT OFFICE.

OF CHICAGO, ILLINOIS.

CLOCK-DIAL.

SPECIFICATION forming part of Letters Patent No. 258,801, dated May 30, 1882.

Application tiled January 30, 1882.

To all whom it may concern:

Beit known that I, J osEPn R. PAYsoN, Jr., a citizen ofthe United States, residing in Chicago, in the county ot' Cook and State of Illinois, have invented certain new and useful improvements in Clock-Dials, of which the following is a specification.

My invention relates to Certain improvenientsin clock-dials havingaluininousface, produced by a phosphorescent compound, whereby the time may be ascertained in the dark.

rIhe object of my invention is to provide a means indiscriminatelyapplicable to all clocl dials, irrespective ot' size or style, in which a phosphorescent compound is utilized for distinguishing the time indicated bythe hands of the clock in the dark in contradistinction to clock -dials having their entire faces illuminated. I attain this object by devices illustrated in the accompanying drawings, in Whichl Figure l is a plan view of a dial embodying my invention, and Fig. 2 a section ofthe same on the line w ot' Fig. 1.

Similar letters of reference indicate the same parts in the iigures ofthe drawings.

A represents an ordinary clock-dial, provided Withl the usual key-holes, B B, and center hole, C, and with the Roman numerals. Mounted upon this clock-dial, and secured as hereinafter described, is a dial, D, the numerals of which correspond and coincide with those of the clock-dial. This dial D has a common center with a clock-dial and a corresponding center hole, and is illuminated by a phosphorescent compound applied to its back if glass, or to its face if of opaque material. rBhe diameter of this supplemental dial D is such that when in position it will extend approximately to but not beyond the key-holes oi' the clockdial, and as such key-holes in all clockdials are at substantially the same distance from the center hole it will be observed that a uniform size of supplemental dial may be made (No model.)

intended to be a dial composed ot' glass, mica,

isinglass, or other translucent material having the phosphorescent compound applied to its back, and to be pasted or glued to the clockdial; but, instead oi'pasting,the two dials may be secured by rivets or other means suitable for holding them, either in close contact or separated. 'lhe supplemental dial may, however, be opaque, like the ordinary clock-dial, and have the phosphorescent compound applied directly to its tace or to any material pasted thereon, as may be suggested, for it must be understood that l do not limit myself to the exact construction described and shown.

The advantage of my construction is that an illuminated dial isprovided which is adapted to be attached or detached, if desirable, i'roin any clock, Whether in stock or in use, and the necessity of keepingin stock illuminated clockdials oi' varying diameters is avoided.

l claiml. A supplemental clock-dial phosphorescentl y illuminated and adapted to be attached to an ordinary clock-dial, substantially as described.

2. rlhe combination, with a clock-dial, of a phosphorescently illuminated supplemental dial having a common center With the clockdial, substantially as described.

3. The combination, with a clock dial, of a phosphorescently illuminated supplemental dial having a common center with the clockdial, and arranged Within a circle having a common center with the clock-dial, but not extending beyond the key-holes, substantially as described.

JOSEPH It. PAYSON, JR.

Witnesses:

J No. G. ELLIOTT, WILLIAM C. WRITING. 

